mon·o·graph 
(mŏnə-grăf′)
(mŏnə-grăf′)n.
A scholarly piece of writing of essay or book length on a specific, often limited subject.
tr.v. mon·o·graphed, mon·o·graph·ing, mon·o·graphs
To write a monograph on.
mo·nogra·pher (mə-nŏgrə-fər) n.
mon′o·graphic adj.
mon′o·graphi·cal·ly adv.